Answer:
B
Explanation:
The method used by the student to test his claim is determine how dissolving salt in water affects the specific heat. The correct option is fourth.
What is specific heat?The specific heat is the amount of heat required to change the temperature by 1°C. It is denoted by C.
A student claims that water's polarity is the reason it has a high specific heat.
Polarity is determined by the salt dissolved in water. So, to determine how dissolving salt in water affects the specific heat is best method.
Thus, the fourth option is correct.
Learn more about specific heat.
https://brainly.com/question/11297584
#SPJ5
8. Simple machines make a job easier to perform by
a. decreasing the amount of work
b. decreasing the amount of friction
c. decreasing the amount of force and/or changing the direction of force
d. only lower the amount of force
Answer:
C
Explanation:
right auricale is bigger then left aurical, why?
Explanation:
Veins carry deoxygenated blood from different parts of the body to our heart. ... Since a larger volume of blood is collected in the right auricle than that of the left auricle, right auricle is larger than the left auricle.
When heat is converted into another form of energy, the total amount of energy is constant. Which law best illustrates this statement?
A.
the first law of thermodynamics
B.
the second law of thermodynamics
C.
the third law of thermodynamics
D.
none of the above
Answer:
A
Explanation:
This is the first law of thermodynamics and it's called the law of conservation of energy
The acceleration due to gravity on Pluto is less than that on the Earth. The mass of a person on Pluto will be
The exact same. gravity has no effect on mass.
Answer:
The acceleration due to gravity on Pluto is less than that on the Earth. The mass of a person on Pluto will be LessExplanation:
Solar energy is a form of
energy from the Sun.
OA) heat
OB) nuclear
OC) mechanical
OD) electromagnetic
Answer:
Solar energy is a form of Electromagnetic energy
Explanation:
Solar energy is constantly flowing away from the sun and throughout the solar system. Solar energy warms the Earth, causes wind and weather, and sustains plant and animal life. The energy, heat, and light from the sun flow away in the form of electromagnetic radiation (EMR
Which of the following machines most likely has the greatest efficiency?
a
A. Airplane
B. Automobile
C. Bicycle
D. Human body
SOMEONE HELP ME!!!!!
When describing image formation in mirrors, what is the angle of reflection?
Answer:
angle of refraction is the same as angle of incidence
Explanation:
Answer:
The angle of reflection is 180 degrees because if you mapped it on a coordinate plane, both the real object and the image in the mirror will be on opposite sides.
100 joule of heat produced each 1 secomd on 4ohm find the potential difference
Answer:
20 V
Explanation:
Power is 100 J/s or 100 W.
We know that P = IV = [tex]\frac{V^{2} }{R}[/tex] .
Isolate the potential difference. V = [tex]\sqrt{RP}[/tex] = [tex]\sqrt{100 * 4}[/tex] = 20 V
Help me pretty please
Answer:a
Explanation:
Which is an example of transforming potential energy to kinetic energy? Select two options
changing thermal energy to electrical energy
changing chemical energy to thermal energy
changing nuclear energy to radiant energy
changing radiant energy to electrical energy
changing mechanical energy to chemical energ
Answer :
.changing chemical energy to thermal energy
.changing nuclear energy to radiant energy
Explanation :
Hope it helps you mate ))Answer:
.changing chemical energy to thermal energy
.changing nuclear energy to radiant energy
Explanation:
Which of the following is equal to an impulse of 9 units?
A. Force = 5, time = 2
B. Force = 1, time = 8.5
C. Force = 2, time = 4.5
D. Force = 3, time = 2
Answer: C. (Force = 2, time = 4.5)
Explanation:
J = FΔt
A. J = 5*2
A. J = 10
B. J = 1*8.5
B. J = 8.5
C. J = 2*4.5
C. J = 9
D. J = 3*2
D. J = 6
Answer:
C. (Force = 2, time = 4.5)
Which statement best describes the long-term effects of using renewable resources?
A) There is an unlimited supply of fresh water on the Earth.
B) Melting glacier ice will supple more fresh water.
C) As populations decrease, renewable resources will also decrease.
D) As demand for renewable energy increase, fossil fuel use will decrease.
Answer:
The answer is D) As demand for renewable energy increase, fossil fuel use will decrease.
Explanation:
I just took the exam
The statement that best describes the long-term effects of using renewable resources is as follows:
As demand for renewable energy increases, fossil fuel use will decrease.Thus, the correct option for this question is D.
What is meant by Renewable resources?Renewable resources may be defined as those resources that cannot be exhausted and are capable in order to furnish a continuous source of clean energy. Examples include hydropower, geothermal power, wind energy, solar energy, etc.
The dependency on renewable resources reduces the demand for non-renewable resources like the combustion of fossil fuels that emit highly toxic constituents in the environment which are extremely harmful to living entities.
Therefore, as demand for renewable energy increases, fossil fuel use will decrease is the statement that best describes the long-term effects of using renewable resources. Thus, the correct option for this question is D.
To learn more about Renewable resources, refer to the link:
https://brainly.com/question/79953
#SPJ2
At which point does the pendulum have the highest velocity
The pendulum has the greatest speed as it passes through the lowest position, straight down, where it was hanging limply before you started it swinging.
Which of the following does NOT use a turbine?
A. Windmills
B. Nuclear power plants
C. Solar panels
D. Geothermal generation station
Answer:
laa a
Explanation:poque usairea ye aire tienfe luza preopia mkr
Answer:
Solar Panels
Explanation:
Can someone explain what ice jacking is and how it can cause structures to fail?
Answer: Rock slope failures can occur due to the presence of water; ice jacking occurs when water between joint or fissure surfaces freezes and expands. This type of failure is progressive, resulting in incremental weakening over time, often requiring several cycles before failure. Ice jacking is one form of rock erosion.
What is the unit of work? Explain whether the unit of work is a fundamental uint
or derived unit
1.
What do you mean by a unit?
2.
unit or a derived unit.
are the fundamental units used in physics?
al Bureau of Weights and Me
Answer:
1)the unit of work is joule. 2)it is derived unit because it is made by two different unit force and displacement .3)
The acceleration due to gravity of jupiter is 25meter per second squar.what does it means?
Answer:
That due the the gravity anything that falls in its gravity accelerates by 25metres per second
Explanation:
You apply a force of 54 N to a car jack in order to change a tire. Each "Crank" of the jack is exerted over a distance of
64 cm. What is the work input on the car jack? (Hint: 1m = 100 cm)
Step # 1
Step #2
Step #3
Explanation:
Work = force × distance
W = (54 N) (0.64 m)
W ≈ 35 J
a care starting from rest has an acceleration 0.3 m/s square, calculate the velocity and distance travelled by this car after 2 minutes?
Answer:
Final velocity (v) = 36 m/s
Distance traveled (s) = 2,160 m
Explanation:
Given:
Initial velocity (u) = 0
Acceleration (a) = 0.3 m/s
Time travel (t) = 2 minutes = 120 seconds
Find:
Final velocity (v) = ?
Distance traveled (s) = ?
Computation:
v = u + at
v = 0 + 0.3(120)
v = 0.3(120)
v = 36 m/s
Final velocity (v) = 36 m/s
Distance traveled (s) = ut + (1/2)at²
Distance traveled (s) = (0.5)(0.3 × 120 × 120)
Distance traveled (s) = 2,160 m
Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?
Inertia is the same thing as mass, more or less. Inertia is the tendency of the object to want to stay in place if at rest, or the object's tendency to stay in motion if a force is applied to it. A train's inertia is massive because it takes a lot of force to move such a large mass, or to slow it down. This is in comparison to the other objects (rubber ball, stone, bike, and the coins).
Answer:
Inertia is the measure of the mass of the body. The greater is the mass of the body; the
greater is its inertia and vice-versa.
(a) Mass of a stone is more than the mass of a rubber ball for the same size. Hence, inertia of
the stone is greater than that of a rubber ball.
(b) Mass of a train is more than the mass of a bicycle. Hence, inertia of the train is greater
than that of the bicycle.
(c) Mass of a five rupee coin is more than that of a one-rupee coin. Hence, inertia of the five
rupee coin is greater than that of the one-rupee coin.
A sports car accelerates from rest at 4 metre per second squared for 10 seconds , its final velocity would be?
Answer:
40m/s
Explanation:
s= NOT NEEDED
u= 0
v= ?
a=4m/s^2
t=10
find the equation
v=u+at
substitute in values:
v=0+4x10
v=40m/s
Answer:
I'm not sure
Explanation:
Because I dont
energy is the ability to___or___ matter
Energy is defined in science as the ability to move matter or change matter in some other way.
A metal rod has a moves with a constant velocity of 40 cm/s along two parallel metal rails through a magnetic field of 0.575 T. If the rails are separated by 20 cm, what is the power generated by the rod? O 341 x 1ow O 6.98 x 103 w O 9.00x 10sw O 8.10 x 105w
Answer:
2.12/R mW
Explanation:
The electrical power, P generated by the rod is
P = B²L²v²/R where B = magnetic field = 0.575 T, L = length of metal rod = separation of metal rails = 20 cm = 0.2 m, v = velocity of metal rod = 40 cm/s = 0.4 m/s and R = resistance of rod = ?
So, the induced emf on the conductor is
E = BLv
= 0.575 T × 0.2 m × 0.4 m/s
= 0.046 V
= 46 mV
The electrical power, P generated by the rod is
P = B²L²v²/R
= B²L²v²/R
So, P = (0.575 T)² × (0.2 m)² × (0.4 m/s)²
= 0.002116/R W
= 2.12/R mW
which refers to a transfer of thermal energy between two objects?
A. potential energy
B. kinetic energy
C. heat
D. temperature
Which of the following characterizes the particles in this diagram?
A. Two positive charges
B. One positive charge and one negative charge
C. Two negative charges
D. Two neutral charges
Answer:
B
Explanation:
One positive charger and one negative charger
A force acting on a body of mass 200g displace it through 200cm in 5s. Find the magnitude of the force if the initial velocity of is Zero
Answer:
F = 0.32 N
Explanation:
GIVEN:
Mass = m = 200 g = 0.2 kg
Distance = S = 200 cm = 2 m
Time = t = 5 s
Initial velocity = U = 0 m/s
REQUIRED
Force = F = ?
SOLUTION
Using Second Equation of Motion,
S = Ut + 1/2 at²
2 = (0)(5) + 1/2 a(5)²
2 = 25/2 a
a = 4/25
a = 0.16 m/s²
So,
Acceleration = a = 0.16 m/s²
Now Using Equation from Newtons Second Law of Motion
F = ma
F = (2)(0.16)
F = 0.32 N
In simple terms describe diffraction, refraction and reflection. Give examples for each.
Answer:
Refraction is the bending of life an example would be how when you put a straw in a glass and it looks like the straw gets detached from itself. Reflection is when light bonces off of something an example would be a mirror.
Explanation:
The way a mirror works is the light you see bounces off of the glass and gives your optical sensors the vision of what the glass reflected.
Answer:
Diffraction , refraction and reflection all are property of light that shows its wave nature.
Explanation:
What is diffraction?When a light ray passes through a narrow single slit , the superposition of secondary wavelets produced by the same source , is called diffraction.
Example ; Single slit experiment in which the diffraction shows maxima and minima .
What is refraction ?The banding of light due to variation in the speed of light when it travels from one medium to another is called refraction.
Example; Divergence or convergence by lenses.
What is reflection ?The bouncing back of light from a surface is called reflection.
Example : Mirrors.
Hence all the given topics are explained.
https://brainly.com/question/10582210
#SPJ2
Se realiza un trabajo mecanico de 3500 J para levantar una cubeta con area cuyo peso tiene una determinada magnitud. Determina la altura a la que se elevo la cubeta
Answer:
10 m
Explanation:
Trabajo (W) = 3500 J, peso de la cuchara (F) = 350 N.
El trabajo es el producto de la fuerza que actúa sobre un objeto y la distancia o desplazamiento. La unidad de trabajo estándar son los joules (J).
Trabajo (W) = fuerza (F) × distancia (d)
W = F × d
[tex]d=\frac{W}{F} =\frac{3500J}{350}=10m[/tex]
el cubo se elevó a 10 m
The height (distance) to which the bucket was raised is equal to 10 meters.
Given the following data:
Work done = 3500 JoulesWeight of bucket = 350 NewtonTo determine the height (distance) to which the bucket was raised:
Mathematically, work done is given by the formula:
[tex]Work\;done = Force \times distance[/tex]
Substituting the given parameters into the formula, we have;
Note: Force = weight.
[tex]3500 = 350 \times distance\\\\Distance = \frac{3500}{350}[/tex]
Distance = 10 meters.
Read more: https://brainly.com/question/22599382
40 POINTS!!! + BRAINLIEST!!!
In your own words, explain how a pendulum demonstrates the concepts of the conservation of energy. (1 or 2 sentences long)
Answer:
I think it is better if you read and shortly write my explanation
Explanation:
simple pendulum with no friction, mechanical energy is conserved. Total mechanical energy is a combination of kinetic energy and gravitational potential energy. As the pendulum swings back and forth, there is a constant exchange between kinetic energy and gravitational potential energy.
Las ruedas de una locomotora de 500 toneladas tiene un coeficiente de friccion estatico con las vias de 0.15 ¿Cual es la fuerza de traccion tangencial maxima ejercida entre las vias y las ruedas?
Answer:
Ff = 7.35*10^5 N
Explanation:
To find the maximum transverse pulling force you use the following formula, for the friction force:
[tex]F_f=\mu N=\mu Mg[/tex] (1)
μ: friction coefficient = 0.15
N: normal force, which is equal to the weight over the wheel
M: mass of th train = 500 ton = 500 000 kg
g: gravitational acceleration = 9.8 m/s^2
You replace the values of the variables in the equation (1):
[tex]F_f=(0.15)(500000kg)(9.8m/s^2)=735000 N=7.35*10^5N[/tex]
hence, the maximum transverse pulling force is 7.35*10^5 N
